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The way I understand it, and I'm not an authority, is that 0db is reference for your receiver's test tones. That should put the test tones at either 75 or 85db depending on the requirement for your particular receiver. As you said, 0db will most likely put normal sound over 100db so be careful. Actual sound level is based on amp power, speaker resistance, speaker efficiency, and room acoustics.
So if you were to manually calibrate your sound room with a sound pressure meter, you would run the receivers internal test tones at 0db.
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